Classifications

• • C—CHEMISTRY; METALLURGY
  • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
  • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
  • C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
  • C04B26/02—Macromolecular compounds
  • C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B26/16—Polyurethanes
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B44—DECORATIVE ARTS
  • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
  • B44C3/00—Processes, not specifically provided for elsewhere, for producing ornamental structures
  • B44C3/04—Modelling plastic materials, e.g. clay

Definitions

• the invention relates to a method of manufacturing figurines with the aid of a mould by filling a mould with a curable mixture comprising more than 90% by weight of fine-granular inorganic material and less than 10% by weight of organic material, said mixture being at least partly hardened in the mould and the object being finally released.
• European Patent Application 0051821 discloses a method of manufacturing articles, especially plates, from the combination of inorganic material and organic binder in a mould, in which the inorganic material is sand, chalk, barium sulphate, corundum, slacks and the like and the mixture is compressed in the mould at a pressure of 100 to 500 kp/cm 2 .
• the mixture in the mould is heated to a temperature of 150 C at the most.
• the present method is improved in that high pressures are not required and the finish of the figurines can be simplified by a specific choice of the inorganic material.
• Belgian Patent Specification 855,060 describes a process of manufacturing articles from a curable mixture of binder and sand in which a specific curing agent is used being a polyol and a polyisocyanate. This Belgian Patent does not provide specific information about the curing conditions other than that river sand is used having a particle size of 0.5 to 2 mm (see Example II of the Belgian Patent).
• the method according to the invention as mentioned in the preamble is characterized in that the mixture is made from 92 to 98% by weight of broken marble grains having a particle size of 0.02 to 0.8 mm and 8 to 2% by weight of organic binder.
• the organic binder is preferably a polyester, metacrylate, epoxy resin and polyurethane, whilst in a further, preferred embodiment the organic binder may be composed of a) a polyol with an accelerator and b) an isocyanide an example of which is mentioned in said Belgian Patent 855,060.
• the organic constituent for which polyurethane, polyester, metacrylate, epoxy resin or polyol/isocyanide may be used, is chosen to be less than an amount of 2% the resultant binding between the marble grains is not sufficient. If the amount of organic binder is more than 8% by weight, the external appearance of the figurine resembles too much that of a figurine of synthetic material.
• the organic binder is chosen in dependence on the desired curing time and the desired colour of the object to be produced.
• the curing time will be chosen to be as short as possible, which may be 5 to 7 minutes when polyurethane is used, mixed as the case may be, with titanium dioxide to provide a white coloured figurine.
• a mixture of 40 g of polyurethane, 30 g of titanium dioxide (titanium white) and about 930 g of marble may be used.
• the curing time is longer being 30 to 120 minutes, which period of time can be reduced by raising the temperature.
• the present method of manufacturing figurines can be carried out by preparing a mixture of marble grains and a first constituent of the organic binder such as polyol to which an accelerator is added to an amount of 3 to 5% calculated on polyol.
• a second mixture is prepared from marble grains and aromatic isocyanide.
• the two mixtures are separately fed to a screw mixer, the mixture reaching a final mixer in which the supplied constituents are mixed and the binder is formed.
• the moulds are filled and vibrated to obtain the desired consolidation.
• the moulds thus filled are kept for the required curing period, after which the moulds are removed.
• the filled moulds will be transported to a place where the moulds are removed, the time of transport being chosen so, that at the place of removal of the moulds the composition in the mould has sufficiently hardened.
• the resultant figurine may be painted. Because white is preferred it is common practice to add titanium dioxide (titanium white) to the basic material. In order to avoid any discoloration by ultraviolet light due to the synthetic material it is desirable to include, in dependence on the binder used, UV stabilizers and comparable additives in the mixture to be made. The use of such additives is known to an expert in this field. Curing in the mould may take place at the ambient temperature, though at higer temperatures the curing period may be shorter.
• the resultant sculpture can be finished manually or by grinding, freed of dust, if any, and then dipped in a dispersion of a lacquer-containing product, for example, an acrylate or a transparent, invisible film on the object so that dirt is repelled and the figurine can be easily cleaned without excessive danger of damage or of loss of material.
• a lacquer-containing product for example, an acrylate or a transparent, invisible film on the object so that dirt is repelled and the figurine can be easily cleaned without excessive danger of damage or of loss of material.
• a figurine By means of said method and by using the said compositions a figurine can be produced within a short time, whilst the article has a quite natural appearance and a high quality comparable to sculptures made by hand.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Ceramic Engineering (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Materials Engineering (AREA)
• Structural Engineering (AREA)
• Organic Chemistry (AREA)
• Dispersion Chemistry (AREA)
• Toys (AREA)

Applications Claiming Priority (2)

Publications (2)

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ID=19841264

Family Applications (1)

Country Status (2)

Cited By (1)

Citations (3)

Family Cites Families (1)

• 1983
  • 1983-01-21 NL NL8300219A patent/NL8300219A/nl not_active Application Discontinuation
• 1984
  • 1984-01-18 EP EP84200055A patent/EP0114710A3/de not_active Ceased

Patent Citations (3)

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